AVR Butterfly walking robot

AVR Butterfly walking robot Figurassa have built simple humanoid robot called Little Brother. The idea was to build cheap humanoid robot which walks. So he managed to do this for less than $70. He have chosen interesting way to make robo walk. He managed to carry robot mass center from one leg to another. This allows to move free leg forward. Simple but it works. Robot central brain is AVR Butterfly kit with three servos attached. Robot body is a product of imagination :). Author used old CD-R and some aluminium. Robot code is developed under Linux AVR-GCC and can be found here. Continue reading

User friendly TDA7313 audio processor control board

Scienceprog has built an audio processor control board with 3 selectable stereo inputs and four outputs. System is built to be a stand-alone device, that can be embedded almost in every audio system. Audio-processor is capable to control Volume, BASS, Treble, attenuation of each output channel.   There is very intuitive menu control installed – parameters are changed by inspecting visual bar in LCD. All Tda7313 functionality is covered with only 5 buttons. Device can also remember last parameter settings. So each time it is powered – last saved parameters are loaded. All project files are available for download including Eagle project, WinAVR project and pre-compiled firmware. Continue reading

AVR based Ethernet development board

AVRnet board is based on AVR Atmega32 microcontroller and ENC28J60 Ethernet controller. Board information can be viewed on LCD with menu navigation buttons.   AVRnet board can be used for various web based controls and data acquisition like temperature sensor reading and logging directly on web page. Current firmware is capable to communicate by using IP, TCP, ICMP, ARP, HTTP protocols. Source code is written under WinAVR compiler tool-set. To start working you will also need to install PHP script in you Apache web server to start reading sensor information via web interface. Continue reading

Three channel fan speed controller for PC

Jos van Eijndhoven have constructed simple but effective PC fan speed controller. He used PIC 16F676 microcontroller to read temperature sensors and provide PWM for three independent channels. Potentiometers control fan start temperature for each fan.     The controller is programmed linearly to increase fan speed when temperature increases and decrease fan speed slowly even if temperature drops fast, in order to avoid instability in control. In Schematic he used switching power MOSFETs BUZ72 to control speed of fans with PWM and LM60 temperature controllers. Also there are ability to connect several fans in parallel to one channel if needed. Code is written in C and compiled to hex with CC5x compiler. Continue reading

Stand alone AVR butterfly datalogger

Nick Lott have been working on datalogger based in AVR butterfly kit. Data-logger is used to monitor environment parameters like temperature, light, voltage, and values from other sensors connected to other inputs: ADC, timer counter. Author wanted to make this project more universal that it could be used in variety projects like weather station, motion-recording with accelerometers, etc.   Datalogger can be configured wia RS232 interface with specially developed queries. With RS232 and joystick you can adjust various logging parameters like logging time intervals and so on. Data is logged to flash memory which contents may be viewed later for instance as graphics. Good ting that project software is open source what allows you to use and change code for you needs. Continue reading